Caliper-gage.



Patented Mar. I8, |902.

A. K. THEIBAULT. cALlPEn GAGE. (Applicntion uled Jan. 2, 1902.)

(No Model.)

WITNESSES n: Noms persas no.. Pnovaumo.. wAsmNcroN. n'. c.

form clampingfingers 13 and 131.

NrTED STATES PATENT OFFICE.

ALBERT K. THEIBAULT, CHICAGO, ILLINOIS.

CAMPER-GAG E.

SPECIFICATION brming' part of Letters Patent No. 695,661, dated March18, 1902.` Application tiled January 2,1902. Serial. No. 88,194. (Nomodel.)

To tif/ZZ whom t muy concern:

Be itknown that I, ALBERT K. THEIBAULT, a citizen of the United States,and a resident of Chicago, county of Cook, and State of Illinois, haveinvented certain new and useful Improvements in Caliper- Gages, of whichthe following is a specification, and which are illustrated intheaccompanying drawings, forming a part thereof.

This invention relates to improvements in caliper-gages, and has for itsobject to'provide an instrument of this character which shall be simplein construction, inexpensive of manufacture, and easy of manipulation.

The invention consists of the novel construction and combination ofparts hereinafter more fully set forth, and particularly pointed out inthe claims, and is illustrated in the accompanying drawings, in which-Figure 1 is an elevation of a caliper-gage constructed in accordancewith my invention. Fig. 2 is a longitudinal section of the same, partsof the device being shown in full lines.' Fig. 3 is an end View of thecaliper-gage looking from the left of Fig. 1. Fig. 4 is a side elevationof the caliper-gage provided with trammel-points, and Fig. 5 relates toa detail ofthe clamping device for the trammel-ponts.

10 indicates a tube or barrel the endsot which are externally threaded,as at 1l, and provided 'with longitudinal slit-s 12, sopasto Threadedupon the said ends are milled nuts 14 and 145.

In one side of the tube 10 and near one end thereof is a longitudinalslot or sight-aperture 15, having at one edge a graduated scale,' as16.. Sliding in the end of the tube adjacent to the slot 15 and adaptedto be held in any desired position by means of the clamping-fingers 13and nut 14::L is a stem 17, having near its inner end a boss 1S. Thisboss projects through the longitudinal slot 15 and in addition toforming a pointer for the graduations 16 also provides a thumb or fingerpiece by means of which the stem 17 may be adjusted in the tube when thenut 14Ca is loosened.

Fitting in the end of the tube 10 opposite that inwhich the stem 17 islocated is a second and longer stem 19. The upper face of the stem 19 isliattened, as at 20, and provided with suitable graduations, as 21. 4Therotation of the stem 19 in the tube is prevented by the flat side 2Othereof and a complementaryflattened portion 22 of the tube 10, as shownin Fig. 3. This end of the tube is also provided with a slot orsight-aperture 23, into which extends a pointer 24 for the graduationson the stem 19.

Near the end of the tube in which the stem 17 is located is a sleeve25,0pening through the wall of the tube and having seated therein a pin26, forced inwardly by a spring 27, reacting between the saidpin and acap 28, screwed upon the sleeve. This pin 26, which is provided with aconical end, is adapted to engage a tapering recess 29 in the stern 17,which engagement takes place when the stem 17 is moved to the limit ofits outward movement, such movement beinggoverned by the lingerpiecelSand the wall of the slot 15 adjacent to the end o f the tube in whichthe stem 17 is located, and the tension of the spring 27 is intended tobe sufficient to cause the pin 26 to force the stem to the limit of itsoutward movement as soon as the conical end of the pin engages thetapered side of the recess 29 in case the stem is not moved quite farenough by the Operator.

In taking internal measurements the nut 14 is first loosened and thestem 19 set to the approximate diameter of the bore or aperture beingmeasured and then clamped by the nut 14m that position. The stem 17isthen moved outwardly until its point comes in contact with the oppositeside of the bore and secured by the nut 14a.. If, forinstance,theinternal diameter of the object is fourteen `and onehalf inches, thepointer of the stem 19 is set at 15, and the pointer of the stem 17 willthen indicate, when 'the latter stem is moved so as to engage theopposite wall of the bore, one-half inch on the scale16, it beingassumed that the gage is of such proportions as to secure thismeasurement by the adjustment described. In adjusting the stem 17 theboss 18, from which the pointerextends, is engaged by the finger orthumb of the hand in which the tube is held to slide the said stem,thereby greatly facilitating the manipulation of IOO the gage, it oftenbeing difficult to useboth hands, as when takinginternal measurements ofan object having a contracted mouth.

In Fig. 4 the caliper-gage is shown pro \ided with a pair oftrammel-points, as 30. Looking at the clamp illustrated at the righthandend of Fig. 4, 3l indicates a cylindrical cup having an aperture 32 inthe bottom and a sleeve 33, projecting from below the aperture. Thissleeve has longitudinal slits St at its free eud,which end is externallythreaded to receive a nut 35, by means of which the pin 30 is removablyclamped in the sleeve. The cup 3l is provided in the opposite sidesthereof with apertures 3G, adapted to register with a diametricalaperture 37 in a block 3S, seated iu the cup 3l, and provided with anupWardlv -extending threaded portion 39, upon which is placed a nut 40.As shown, the stem is passed through the registering apertures of thecup 3l and block 38 and the nut `IO then turned up on the threadedportion ot the blockSS until it bears against the rim of lthe cup, thisaction tending to separate the cup and block, and thereby securel7clamping them on t-he stem.

I claim as my invention-- l. In a caliper-gage, in combination, a tubehaving a longitudinal slot provided with graduations at the sidethereof, a stem located in the end ot' the tube adjacent to the slot andhaving a pointer for the said graduations, a second stem located in theopposite end of the said tube and provided with graduations, asight-aperture in the tube through which the graduations of said stemare visible, and means for securing the said stems against movement.

2. In a caliper-gage, in combination, a tube having a longitudinal slot,a stem sliding in one end of the tube and having a finger-pieceprojecting through the said slot,a second stem located in the oppositeend of the said tube and provided with graduations, a sight-aperture inthe tube through which the graduations of the stem are visible, the endsof the said tube being slitted, and nuts for clamping the slitted endsabout the stems.

In a caliper-gage, in combination, atube having a longitudinal slotprovided With graduations along one edge thereof", a stem sliding in theend of the tubeadjacent to the slot and having a pointer for the saidgraduations and a tapering recess in one side,acap closed sleeve openingthrough the Wall of the tube, a spring-pressed pin seated in said sleeveand having a conical point adapted to engage the recess in the stem, asecond stem located in the opposite end of the tube and provided Withgraduations, a sight-aperture in the tube through which thestem-graduations are visible, and means for securing thc stems againstmov-ement.

4. In a caliper-gage, in combination, a tube having a longitudinal slotprovided with graduations at the side thereof, a stem lo-V cated in oneend of the tube and having a pointer which plays in the slot, a secondstem located in the opposite end of the tube, trammel-points, a clampfor securing a trammelpoint to each stem and which comprises a cuphaving apertures at opposite sides thereof and a block having a threadedportion projecting therefrom and a diametrical aperture adapted toregister with the apertures in the cup, and a nut screwed upon thethreaded portion to slide the block in the cup to secure the stempassing through the apertures of the cup and block.

5. In a caliper-gage, in combination,a tube, a stem sliding into eachend ot the tube, nuts on the ends of the tube to clamp the stems againstmovement, a trammel-point for each of the said stems, a cup to whicheach trammel-point is secured and having apertures through oppositesides thereof, a block located in the cup and having a diametricalaperture registering with the apertures in the cup, and through whichapertures the stem passes, a threaded portion projecting from the block,and a nut upon the threaded portion adapted to be screwed against theupper end of the cup to clamp the trammel-point to the stem.

ALBERT K. THEIBAULT. Witnesses:

ARTHUR B. SELBOLD, E. M. KLA'rcI-inn.

